问题 问答题 简答题

热处理的目的是?常见热处理的方法?

答案

参考答案:

热处理的目的是将钢在固态下,按预定的工艺方法进行加热、保温和冷却,通过改变其内部组织和结构以达到改变或改善性能的目的。热处理常用的方法有退火、正火、淬火、回火以及表面淬火及化学热处理等。

单项选择题
阅读理解

阅读理解匹配题。

     Some students are going to some different (不同的) places this weekend. Where are they going? Can you

find their places they want to go?

     ( )1 Sally: I have a pen pal in Wenchuan. Some days ago, I got a letter from her. She said she needed

some school things. I bought some and I want to post them to her. So this weekend, where will I go? Do you

know?

     (      )2. Ricky: I don't like weekends. For me, I have no weekends. My parents usually ask me to go to

evening school to learn English and other subjects. I always feel tired. That's why I don't like weekends.

     (     )3. Barbara: I love weekends. I can do what I want to do. I want to go to a quiet place to study because

Mid-term Exam (期中考试) is coming. I want to borrow (借) some books from that place and return (还) some

to that place. Do you know where I want to go?

     (      )4. Angle: This weekend will be an exciting one for me. My parents are going to take me to have

something special (特别的) in the place. It is said that we can try (尝试) some Indian food. Isn't it interesting!

     (      )5. Stella: I want to relax myself on weekends. This weekend, I want to do something different. I want

to go to this place. There, you can see many kinds of animals there. And children like to go there with their

parents.

             A                          B                             C                            D                         E